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https://pokemonblog.com/2020/11/25/dragon-type-month-arceus-dialga-palkia-gx-tag-team-was-first-introduced-in-pokemon-tcg-sun-moon-cosmic-eclipse/
Dragon-Type Month: Arceus & Dialga & Palkia-GX TAG TEAM was first introduced in Pokémon TCG Sun & Moon—Cosmic Eclipse